Dandy-roll support for paper machines



March 22 1927.

E. N. DAULTON DANDY ROLL SUPPORT FOR PAPER MACHINES 2 Sheets-She et 1 Filed Nov. 27. 1925 QN MN NM E Q Q MN WN 9N N H lmm X m. MN NM wbMH WW WN Q a km RN WW March 22 1927.

' 1,621,874 E'. N. DAULTON DANDY ROLL SUPPORT FOR PAPER MACHINES Filed Nov. 27, 1925 2 Sheets-Sheet 2 [Wen/0r Ems? lllDw/zm Patented M... 22, 1927.

UNITED STATES ERNEST N. DAUL'ION, OF FITGI-IIBURG, MASSACHUSETTS.

DANDY-ROLL SUPPORT FOR PAPER MACHINES.

Application filed November 27, 1925.

This invention relates to means for supporting the dandy roll on a paper machine. This dandy roll is used to press the pulp upon the wire screen or apron in forming the sheet of paper, and may also be used for impressing a water mark on the paper stock.

It has been customary to allow the roll to rest freely upon the paper pulp and screen. Consequently rolls of different diameter or of different weight have varied greatly in the pressure which they have applied to the apron and pulp.

It is the object of my invention to provide a yielding support for such a dandy roll, so designed that the effective weight of the roll on the paper pulp may be adjusted and controlled to the end that the effective weight of rolls of different diameters and constructions may be varied or equalized as desired.

A further feature of my invention is to provide means for preventing or limiting the rebound of the heavy dandy roll, which may be caused by the use of a roll which is not exactly cylindrical or may be caused by slackness in the wire screen or apron. Such rebound frequently results in crushing the edge of the sheet of paper being formed, causing a weak place in the paper.

In the preferred form, my invention is combined with a trolley rail and stand or support, such as is used to facilitate removing and replacing of the long heavy dandy rolls in a paper machine. My invention further relates to arrangements and co1nbinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings, in which- Fig. 1 is a front elevation of my improved dandy roll support;

Fig. 2 is a side view thereof; and Fig. 3 is a detail sectional plan view, looking in the direction of the arrow 3 in Fig. 2.

Referring to the drawings, I have in dicated a portion of the frame of a paper machine and also two of the small cylinders or rolls 11 over which the apron 12 is guided. A stand 13 is secured to the frame 10 at each side of the machine, and supports a fixed shaft 14 on which a trolley 15 is movably mounted. This trolley 15 is provided for convenience in removing the heavy dandy Serial No. 71,676.

rolls 16 from the machine, or in replacing the same.

Each stand 13 is preferably formed in two parts, the upper part being threaded at its lower end, as indicated at 17 in Fig. 2, and is provided with a base 18 in which the part 17 is vertically slidable. An adjusting nut 19 and look nut 20 are threaded on the port-ion 17 to provide for raising or lowering the stand 13, and a set screw 21 engages the lower end of the portion 17 to secure the parts firmly together after such vertical adjustment.

A shaft 22 is pivoted in the stand 13 and is provided with arms 23 having bearing portions 24 for the dandy roll 16. Each arm 23 is also extended upwardly above the shaft 22 as indicated at 25, and the upper end of each projection 25 is engaged by a springpressed plunger 26 (Fig. 3). This plunger is slidablein a cylinder 27 formed on the side of the stand 13, said cylinder also housing a coil spring 28 which exerts constant downward pressure on the plunger 26. springs 28 act through the projections 25 and arms 23, tending to swing the dandy roll 16 away from the apron 12, and thus partiaillly counteracting the weight of the heavy r0 2 An adjusting screw 29 in the upper end of each cylinder 27 engages a plug or stop 30 which may be thus moved axially of the cylinder to adjust the tension of the spring 28. A look nut 31 retains the screw 29 in adjusted position.

By thus adjusting the tension of the springs 28, the weight of the dandy roll 16 may be offset to any desired extent, thus placing any suitable pressure upon the paper stock on the wire screen or apron.

When a roll of different diameter is to be used, the stand 13 may be adjusted verticall to correspond to the diameter of the new rolii The plunger 26 is preferably slotted, as indicated at 32 in Fig. 3, and is held from displacement in the cylinder 27 by a cotter pin 33 (Fig. 2) or in any other convenient manner.

The shaft 22 is preferably extended at the ends beyond the corresponding stands 13 and is provided with handles 34: by which the dandy roll may be lifted manually away from the apron 12 when desired. Latches 35 may be used to hold the roll elevated.

Having thus described my invention and The the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claims. What I claim is 1. In a paper machine, a wire apron, a dandy roll, bearings for said roll, apair of arms on which said bearings are mounted and by which said roll is entirely supported and positioned above said apron, said arms being pivotally mounted, springs effectve to apply yielding pressure to said arms to partially counterbalance said roll and tending to swing said roll away from said apron, means to adjust the tension of said roll, and means to swing said arms simultaneously to lift said roll from said apron.

2. In a paper machine, a wire apron, a dandy roll, bearings for said roll, a pair of arms on which said bearings are mounted and by which said roll is entirely supported and positioned above said apron, said arms being pivot-ally mounted, springs effective to apply yielding pressure to said arms to partially counterbalance said r ll and tending to swing said roll away from said apron, means to adjust the tension of said roll, means to swing said arms simultaneously to lift said roll from said apron, and means to hold said roll in raised position.

In a paper machine, an apron, a dandy roll, a trolley rail, a stand therefor, apair of arms providing bearings for and supporting said rolls above said apron, said arms being pivotally mounted on the stand, and having upwardly projecting portions, and a spring on each side of the stand engaging the upwardly projecting portions of the arms, said springs tending to swing said bearings and roll away from the apron.

4. In a paper machine, an apron, a dandy roll, a trolley rail, a stand therefore, a pair of arms providing bearings for and supporting said rolls above said apron, said arms being pivot-ally mounted on the stand, and having upwardly projecting portions, and a spring on each side of the stand engaging the upwardly projecting portions of the. arms, said springs tending to swing said bearings and roll away from the apron, and an adjusting screw effective to compress each of said springs and thereby increase the pressure thereof on its respective projecting arm.

5. In a paper making machine, a dandy roll, a trolley rail, a stand therefor, said stand comprising a threaded portion, and a base in which said threaded portion is slidable, a nut on said threaded portion engaging said base to lift said stand, and means to secure said threaded portion in adjusted position in said base.

In testimony whereof I have hereunto affixed my signature.

ERNEST N. DAULTON. 

